Because not only HLA-A alleles but also HLA-B*51 seemed to be associated with skin lesions or uveitis (Table 4, Additional file 1), we stratified the occurrence of skin lesions or uveitis according to the presence or absence of HLA-B*51 and particular HLA-A alleles to better assess the independent effect of HLA-A*02:07 and A*26:01 and their genetic interaction with HLA-B*51 on these clinical manifestations (Table 5). Here, HLA-A is linked to uveitis.